Maintenance & Technical > KX100 / KX85 / KX80 / KX65 / KX60

Kx85 going thru cranks

<< < (2/5) > >>

85#371:
Have done plug tests using three brand new plugs and its definitely not too lean I'm going to da a compression test on it Friday and see how that goes if I was to guess it seems as maybe it's sucking air from the motor and leaning it out but it doesn't show on the plug I have the old crank from the first time and I'm no expert but it seems fine but after replacing it ran great

85#371:
I'm not an engine expert but it boggles my mind how the crank would be the issue what would the crank haveto do with it sputtering at higher rpm'a unless it's sucking air leaning it out not giving it enough fuel. I just know for fact I replaced everything and last ditch effort put a crank in it and ran great only for 15 hours though

k2000x:
Nothing wrong with hot rods had one in my yz125 for 5 yrs racing now a local kids still thrashing it
More like its you crank seals leaking

Foxx4Beaver:

--- Quote from: 85#371 on March 30, 2015, 02:37:43 PM ---I'm not an engine expert but it boggles my mind how the crank would be the issue what would the crank haveto do with it sputtering at higher rpm'a unless it's sucking air leaning it out not giving it enough fuel. I just know for fact I replaced everything and last ditch effort put a crank in it and ran great only for 15 hours though

--- End quote ---

Have you checked and or set your float height?...it could be set too low.
Another possibility that I never used to believe, until it happened to one of my friends bikes...is the fuel cap vent. If it gets clogged, the fuel won't flow correctly...there's even some threads on fuel cap issues on here too.
Have you checked for excessive play in your crank bearings?
Does it smoke excessively when running?

**EDIT**
check the magnet on the flywheel for cracks or chips too.

85#371:
Have checked float height when we first got the bike it would leak fuel from overflow and we cleaned and adjusted the float.never have checked the cap or vent hose but will do Friday amongst other things that I will post. Thanks for your help

Navigation

[0] Message Index

[#] Next page

[*] Previous page